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Efficacy and safety of atezolizumab and bevacizumab in appendiceal adenocarcinoma.
Cancer Res Commun 2024 May 7
PURPOSE: Appendiceal Adenocarcinoma (AA) remains an orphan disease with limited treatment options for patients unable to undergo surgical resection. Evidence supporting the efficacy of combined VEGF and PD-1 inhibition in other tumor types provided a compelling rationale for investigating this combination in AA, where immune checkpoint inhibitors (ICIs) have not been previously explored.
PATIENTS AND METHODS: We conducted a prospective, single arm phase 2 study evaluating efficacy and safety of atezolizumab in conjunction with bevacizumab (Atezo+Bev) in advanced, unresectable AA.
RESULTS: Patients treated with the Atezo+Bev combination had 100% disease control rate (1 PR, 15 SD) with progression free survival (PFS) of 18.3 months and overall survival not-yet-reached with median duration of follow up of 40 months. These survival intervals were significantly longer relative to a clinically and molecularly matched synthetic control cohort treated with cytotoxic chemotherapy designed for colorectal cancer (PFS of 4.4 months, p = .041).
CONCLUSIONS: In light of recent data demonstrating a lack of efficacy of 5-FU based chemotherapy, Atezo+Bev is a promising treatment option for patients with low-grade unresectable AA; further study is warranted.
PATIENTS AND METHODS: We conducted a prospective, single arm phase 2 study evaluating efficacy and safety of atezolizumab in conjunction with bevacizumab (Atezo+Bev) in advanced, unresectable AA.
RESULTS: Patients treated with the Atezo+Bev combination had 100% disease control rate (1 PR, 15 SD) with progression free survival (PFS) of 18.3 months and overall survival not-yet-reached with median duration of follow up of 40 months. These survival intervals were significantly longer relative to a clinically and molecularly matched synthetic control cohort treated with cytotoxic chemotherapy designed for colorectal cancer (PFS of 4.4 months, p = .041).
CONCLUSIONS: In light of recent data demonstrating a lack of efficacy of 5-FU based chemotherapy, Atezo+Bev is a promising treatment option for patients with low-grade unresectable AA; further study is warranted.
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